Graduation date: 1993Air compressor systems are inefficient energy transfer devices even under\ud the best of conditions, at full load. When only part load is required, efficiency\ud drops further. This thesis attempts to improve part load efficiency of twin rotor\ud screw air compressors in three ways.\ud First, a guidebook was written to help educate compressor users and\ud purchasers about the significance of part load efficiency and to aid in selecting the\ud most efficient controls for a given application.\ud Second, a spreadsheet-based model was developed to analyze the\ud performance of cycling control strategies by performing a detailed simulation of\ud one complete compressor cycle. Model calculations demonstrated that cycling\ud losses can significantly increase average power as cycle time decreases, and that\ud low-unload controls may be more efficient at low loads than is traditionally\ud assumed.\ud Third, a microprocessor-based controller was designed and built to enhance\ud part load performance of combined modulating and unloading type control\ud systems. The "smart" controller is presented in this thesis. Case study results\ud showed energy savings of 4% to 32% over conventional controllers
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